WO2004097918A1 - エッチング液、剥離液およびエッチング方法 - Google Patents
エッチング液、剥離液およびエッチング方法 Download PDFInfo
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- WO2004097918A1 WO2004097918A1 PCT/JP2004/006286 JP2004006286W WO2004097918A1 WO 2004097918 A1 WO2004097918 A1 WO 2004097918A1 JP 2004006286 W JP2004006286 W JP 2004006286W WO 2004097918 A1 WO2004097918 A1 WO 2004097918A1
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- WO
- WIPO (PCT)
- Prior art keywords
- acid
- organic
- etching
- resist
- film
- Prior art date
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- 238000005530 etching Methods 0.000 title claims abstract description 197
- 239000007788 liquid Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 48
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- 239000000463 material Substances 0.000 claims description 68
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- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 claims description 8
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- BYEVBITUADOIGY-UHFFFAOYSA-N nonanoic acid ethyl ester Natural products CCCCCCCCC(=O)OCC BYEVBITUADOIGY-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- WLGDAKIJYPIYLR-UHFFFAOYSA-N octane-1-sulfonic acid Chemical compound CCCCCCCCS(O)(=O)=O WLGDAKIJYPIYLR-UHFFFAOYSA-N 0.000 description 1
- WWZKQHOCKIZLMA-UHFFFAOYSA-M octanoate Chemical compound CCCCCCCC([O-])=O WWZKQHOCKIZLMA-UHFFFAOYSA-M 0.000 description 1
- CBFCDTFDPHXCNY-UHFFFAOYSA-N octyldodecane Natural products CCCCCCCCCCCCCCCCCCCC CBFCDTFDPHXCNY-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- FKCRAVPPBFWEJD-XVFCMESISA-N orotidine Chemical compound O[C@@H]1[C@H](O)[C@@H](CO)O[C@H]1N1C(=O)NC(=O)C=C1C(O)=O FKCRAVPPBFWEJD-XVFCMESISA-N 0.000 description 1
- RJQRCOMHVBLQIH-UHFFFAOYSA-M pentane-1-sulfonate Chemical compound CCCCCS([O-])(=O)=O RJQRCOMHVBLQIH-UHFFFAOYSA-M 0.000 description 1
- UYGGIIOLYXRSQY-UHFFFAOYSA-N pentyl 2-methylpropanoate Chemical compound CCCCCOC(=O)C(C)C UYGGIIOLYXRSQY-UHFFFAOYSA-N 0.000 description 1
- CFNJLPHOBMVMNS-UHFFFAOYSA-N pentyl butyrate Chemical compound CCCCCOC(=O)CCC CFNJLPHOBMVMNS-UHFFFAOYSA-N 0.000 description 1
- DZOQJRHASSOUOU-UHFFFAOYSA-N pentyl nonanoate Chemical compound CCCCCCCCC(=O)OCCCCC DZOQJRHASSOUOU-UHFFFAOYSA-N 0.000 description 1
- FGPPDYNPZTUNIU-UHFFFAOYSA-N pentyl pentanoate Chemical compound CCCCCOC(=O)CCCC FGPPDYNPZTUNIU-UHFFFAOYSA-N 0.000 description 1
- TWSRVQVEYJNFKQ-UHFFFAOYSA-N pentyl propanoate Chemical compound CCCCCOC(=O)CC TWSRVQVEYJNFKQ-UHFFFAOYSA-N 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- YPJUNDFVDDCYIH-UHFFFAOYSA-N perfluorobutyric acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)F YPJUNDFVDDCYIH-UHFFFAOYSA-N 0.000 description 1
- CXGONMQFMIYUJR-UHFFFAOYSA-N perfluorododecanoic acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F CXGONMQFMIYUJR-UHFFFAOYSA-N 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- IUGYQRQAERSCNH-UHFFFAOYSA-N pivalic acid Chemical compound CC(C)(C)C(O)=O IUGYQRQAERSCNH-UHFFFAOYSA-N 0.000 description 1
- 239000003495 polar organic solvent Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- HUAZGNHGCJGYNP-UHFFFAOYSA-N propyl butyrate Chemical compound CCCOC(=O)CCC HUAZGNHGCJGYNP-UHFFFAOYSA-N 0.000 description 1
- OVFMRFMJVFDSAA-UHFFFAOYSA-N propyl decanoate Chemical compound CCCCCCCCCC(=O)OCCC OVFMRFMJVFDSAA-UHFFFAOYSA-N 0.000 description 1
- HTUIWRWYYVBCFT-UHFFFAOYSA-N propyl hexanoate Chemical compound CCCCCC(=O)OCCC HTUIWRWYYVBCFT-UHFFFAOYSA-N 0.000 description 1
- HCMSDHYNNJTLRW-UHFFFAOYSA-N propyl nonanoate Chemical compound CCCCCCCCC(=O)OCCC HCMSDHYNNJTLRW-UHFFFAOYSA-N 0.000 description 1
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 229940107700 pyruvic acid Drugs 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- XRCRWCVBMHENNE-UHFFFAOYSA-N sym-di-n-butyl citrate Natural products CCCCOC(=O)CC(O)(C(O)=O)CC(=O)OCCCC XRCRWCVBMHENNE-UHFFFAOYSA-N 0.000 description 1
- 229940095064 tartrate Drugs 0.000 description 1
- 229960003080 taurine Drugs 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- RXPQRKFMDQNODS-UHFFFAOYSA-N tripropyl phosphate Chemical compound CCCOP(=O)(OCCC)OCCC RXPQRKFMDQNODS-UHFFFAOYSA-N 0.000 description 1
- WRFZKAGPPQGDDQ-UHFFFAOYSA-N valeryl hexanoate Chemical compound CCCCCOC(=O)CCCCC WRFZKAGPPQGDDQ-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/265—Carboxylic acids or salts thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
- G03F7/422—Stripping or agents therefor using liquids only
- G03F7/426—Stripping or agents therefor using liquids only containing organic halogen compounds; containing organic sulfonic acids or salts thereof; containing sulfoxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/0206—Cleaning during device manufacture during, before or after processing of insulating layers
- H01L21/02063—Cleaning during device manufacture during, before or after processing of insulating layers the processing being the formation of vias or contact holes
-
- C11D2111/22—
Definitions
- the present invention relates to a resist and an anti-reflection coating (BARC), an etching solution, a stripping solution, and an etching method for removing an embedding material or a dry etching residue.
- BARC anti-reflection coating
- the present invention relates to an etching solution, a stripping solution, and an etching method for simultaneously or separately removing a barrier coating (BARC), an organic filling material or a dry etching residue.
- the film after the dry etching, 0 2 plasma mediation Thing was not removed the line Le , resist and antireflection film force such treatment would damage the low- k film. Therefore, it is desirable to remove the resist and the anti-reflection film by etching with a chemical solution without performing O2 plasma etching (or after performing H2 plasma etching or light 02 plasma etching).
- the currently proposed etchant and stripper do not completely remove the anti-reflective coating and the resist formed on the low-k film, or the low-k film is etched. It cannot be used as an etchant or stripper.
- An object of the present invention is to provide an etching solution, a stripping solution, and an etching method for removing a dry etching residue such as an antireflection film and a resist in a semiconductor manufacturing process, or a filling material, and a polymer. I do.
- FIG. 1 shows an anti-reflection film (BARC) 2 and a resist while using the etching solution and the stripping solution of the present invention and maintaining a low-k film 5 on an object to be processed having a low-k film 5 on a substrate 4.
- FIG. 6 is a diagram illustrating a technique for removing a filling material 3, and a dry etching residue 1.
- the present invention provides the following etching solution and stripping solution, an etching method, and the like.
- Item 1 A group consisting of a resist on an insulating film containing at least one organic acid, an organic antireflection film, an organic burying material, and a dry etching residue. Etching solution for removing from objects.
- Item 2 The etching solution and the stripping solution according to claim 1, wherein the insulating film is a low-k film.
- Item 3 A group consisting of an organic solvent and water
- Item 4 The etching solution and the stripping solution according to Item 2 for removing the organic antireflection film and the resist formed on the low-k film.
- Item 5 The etching solution according to any one of Items 1 to 4, wherein the etching rate power of the organic antireflection film is 0.1 AZ min or more, and the etching rate of the low-k film is 30 AZ min or less. Stripper.
- Item 6 The etching solution and the stripping solution according to any one of Items 1 to 5, wherein the organic acid has at least one selected from the group consisting of a carboxylic acid group and a sulfonic acid group.
- the organic acid is formic acid, butyric acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monofluoroacetic acid, difluoroacetic acid, trifluoroacetic acid, monobromoacetic acid, dibromoacetic acid, triproacetic acid, perfluoropropionic acid, and perfume.
- Item 1 is an etching solution or a stripping solution according to any one of! To 5.
- Item 9 The etching solution and the stripping solution according to any one of Items! To 8, which are organic acid methanesulfonic acid.
- Organic solvents are monohydric alcohols, polyols, ketones, amides, nitriles, alcohols, alkylene glycol monoalkyl ethers, ethers, esters, hydrocarbons, halogen compounds, fluoroalcohols
- Item 11 An etching solution and a stripping solution according to any one of Items 1 to L0, in which a workpiece having a resist, an organic antireflection film, and an organic burying material on an insulating film is used for rework in a dual damascene process.
- a method for removing a resist, an organic antireflection film and an organic burying material which includes a step of treating with an organic material.
- An anti-reflection method including a step of treating an object having an organic anti-reflection film and a resist on an insulating film in this order with an etching solution or a stripping solution according to any one of Items:! How to remove film and resist.
- Item 13 An etching solution according to any one of Items 1 to 10 having an organic antireflection film and a resist on an insulating film in this order, and further including an organic embedding material.
- Item 14 An organic filling material including a step of treating an object having an organic filling material in a groove formed by dry etching with an etching solution and a stripping solution according to any one of Items 1 to 10. How to remove.
- Item 15 The method according to any one of Items 11 to 14, wherein the treatment of the object is performed by ultrasonic cleaning.
- Item 16 A resist stripped product obtained by the method according to any one of Items 11 to 13.
- Item 17. Etching residue on the side wall of the groove formed by dry etching, containing at least one organic acid and hydrogen fluoride (HF) and, if necessary, at least one organic solvent, An organic anti-reflective coating and resist, and an etchant and stripper to remove the organic burying material if necessary.
- HF organic acid and hydrogen fluoride
- An organic anti-reflective coating and resist and an etchant and stripper to remove the organic burying material if necessary.
- a method for removing an etching residue, an organic antireflection film, and a resist, comprising a step of treating with an etching solution containing (HF) and a strip
- Item 19 At least one object to be processed having an etching residue on a sidewall of a groove formed by dry etching, having a filling material in a via hole, and having an organic antireflection film and a resist on an insulating film.
- Item 20 An object to be processed having an etching residue on a sidewall of a groove formed by dry etching and having an organic antireflection film and a resist on an insulating film is described in any one of Items 1 to L0.
- Remove the organic anti-reflective coating and the resist by treating with an etching solution and a stripping solution, and then use an etching solution containing hydrogen fluoride (HF) and at least one organic solvent and / or at least one organic acid.
- HF hydrogen fluoride
- Item 21 An object to be processed having an etching residue on a sidewall of a groove formed by dry etching, having a filling material in a via hole, and having an organic antireflection film and a resist on an insulating film, is described in Item 1
- To remove the organic antireflection film, the resist, and the filling material, and then hydrogen fluoride (HF) and at least one organic solvent and Z or at least 1 A stepwise method for removing an organic antireflection film, a resist, a burying material, and an etching residue, comprising removing the etching residue by treating with an etching solution containing a kind of organic acid.
- HF hydrogen fluoride
- Item 22 An object having an etching residue on the side wall of a groove formed by dry etching and having an organic antireflection film and a resist on an insulating film is treated with at least one type of hydrogen fluoride (HF). Treat with an etching solution containing an organic solvent to remove etching residues.
- HF hydrogen fluoride
- a stepwise removal method for an etching residue and an organic antireflection film and a resist, comprising removing the organic antireflection film and the resist by treating with the etching solution and the stripping solution according to any one of the above.
- Item 23 Fluoride is applied to an object that has an etching residue on the side wall of a groove formed by dry etching, has a filling material in a via hole, and has an organic antireflection film and a resist on an insulating film.
- Treatment with an etching solution containing hydrogen (HF) and at least one organic solvent to remove etching residues, followed by treatment with an etching solution or a stripping solution according to any of Items 1 to 10 to remove organic residues A stepwise method for removing an etching residue, an organic antireflection film, a resist, and a burying material, comprising removing the antireflection film, the resist, and the burying material.
- the etching solution and the stripping solution of the present invention can etch the antireflection film, thereby stripping and removing the resist on the antireflection film.
- etching solution and stripping solution means that it can be used both as an etching solution and as a stripping solution.
- the etching residue can be mainly removed by peeling, and the organic filling material can be removed by etching.
- the “etching solution and stripping solution” of the present invention act as a stripping solution and an etching solution, respectively. Also, when removing the organic anti-reflection film and the resist, it has both effects of an anti-reflection film etching solution and a resist stripping solution.
- the antireflection film 2 of the present invention is formed on an insulating film 5.
- the insulating film include a silicon oxide film and a low-k film.
- the antireflection film is preferably formed on a low-k film.
- a filling material for a groove (hole) formed by dry etching such as a via hole or a trench used in a dual damascene process or the like can be removed by etching using the etching solution and the stripping solution of the present invention.
- a via hole and a trench are preferably exemplified.
- etching residues in grooves (holes) formed by dry etching can be removed by an etching solution containing an organic acid and HF.
- the etching solution, the stripping solution and the etching method of the present invention can remove the antireflection film and the filling material without substantially damaging the km-k film.
- the etching solution and the stripping solution of the present invention contain an organic acid, and may optionally contain at least one selected from the group consisting of water and an organic solvent.
- organic acid examples include those having a carboxylic acid group or a sulfonic acid group, and specific examples include monocarboxylic acid, monosulfonic acid, polysulfonic acid, and polycarboxylic acid.
- Monocarboxylic acids include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, caprylic acid, enanthic acid, octanoic acid, nonanoic acid, decanoic acid, pendecanoic acid, dodecanoic acid, and trimethylacetic acid , Monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monofluoroacetic acid, difluoroacetic acid, trifluoroacetic acid, monobromoacetic acid, dibromoacetic acid, tribromoacetic acid, ⁇ : —chlorobutyric acid, ⁇ -monobutyric acid, y-clobutyric acid, Lactic acid, acrylic acid, glycolic acid, glyceric acid, pyruvic acid, glyoxalic acid, acetoacetic acid, benzylic acid, anthranilic acid
- polycarboxylic acids examples include oxalic acid, malonic acid, succinic acid, daltaric acid, adipic acid, suberic acid, azelaic acid, maleic acid, fumaric acid, phthalic acid, terephthalic acid, isophthalic acid, and sake At least one selected from the group consisting of lithic acid, malic acid, citric acid, benzenetricarboxylic acid and benzenetetracarboxylic acid,
- polysulfonic acid benzenedisulfonic acid is exemplified.
- Preferred organic acids include formic acid, butyric acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monofluoroacetic acid, difluoroacetic acid, trifluoroacetic acid, monobromoacetic acid, dibromoacetic acid, tribromoacetic acid, perfluoropropionic acid, and perfluorophenol.
- Orobutanoic acid perfluoropentanoic acid, perfluorohexanoic acid, perfluoroheptanoic acid, perfluorooctanoic acid, perfluorononanoic acid, perfluorodecanoic acid, perfluoroundecanoic acid, perfluorod Decanoic acid, 3,3,3-trifluoro-2- (trifluoromethyl) propionic acid, 3H-tetrafluoropropionic acid, 5H-octafluoropentanoic acid, 7H-dodecafluoroheptanic acid, 9H- Examples include xadecafluorononanoic acid, methanesulfonic acid, and dodecylbenzenesulfonic acid It is.
- Organic solvents include methanol, ethanol, isopropanol (IP A :), 1-propanol
- Polyols such as ethylene glycol, diethylene glycol, 1,2-propanediole, propylene glycol, 2,3-butanediol, and glycerin;
- Ketones such as acetone, acetylacetone, methylethylketone, methylisobutylketone, cyclohexanone, getylketone, diisobutylketone;
- Amides such as formamide, N-methylformamide, N, N-dimethylformamide, acetamide, N-methylacetamide, N, N-dimethylacetamide;
- Nitriles such as acetonitrile, propionitrile, ptyronitrile, isobutyronitrile, benzonitrile;
- Aldehydes such as honolemuanolaldehyde, acetoaldehyde and propionaldehyde; anolexylene glycol monoalkyl ethers such as ethylene glycol monomethinole ether and ethylene glycol monoethyl ether; Ethers such as tetrahydrofuran, dioxane, diisopropyl ether, dibutyl ether, tetrahydropyran, anisole, 1,2-dimethoxyethane, diethylene glycol dimethyl ether;
- Hydrocarbons such as hexane, cyclohexane, octane, isooctane, benzene, and toluene;
- Halogenated hydrocarbons such as chloropho / rem, 0-dichlorobenzene, norfluorohexane, norfluoromethinolecyclohexane;
- Fluoroalcohols such as trifluoroethanol, pentafluoropropanol, 2,2,3,3-tetrafluoropropanol;
- Nitrogen-containing organic solvents such as tetramethylurea and N-methyl-1-pyrrolidone;
- Ester phosphate solvents such as dimethyl phosphate, dibutyl phosphate, diphenyl phosphate, dibenzyl phosphate, trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate, and triphenyl phosphate. .
- Methanol, ethanol, ⁇ , 1-propanol, hexanol, propylene glycol, diethylene glycolone, ethylene glycol, glycerin, honolemamide, ⁇ -methylformamide, ⁇ , ⁇ -dimethylforma De is more preferable.
- esters, ketones, monohydric alcohols, polyhydric alcohols, amides, ethers, alkylenes may be used as organic solvents. At least one member selected from the group consisting of glycol monoalkyl ethers, phosphate esters, and nitrogen-containing compounds is preferred.
- Organic acids having an acceptor number of 50 to 200 are preferable, and those of 80 to 200 later, from the viewpoints of the releasability or removability of the antireflection film and the resist and the removability of the underfill material embedded in via holes.
- Power S better than S.
- the Akuseputa number Alpha New, Akuseputa of measure proposed by Mayer-Gutmann i.e. a measure of a Lewis acid solvent.
- ⁇ ⁇ 100 ⁇ (solvent) / [ ⁇ ((C 2 F 5 ) 3 in 1,2-dichloroethane 3 P0'SbCl 5 )- ⁇ (solvent in ( ⁇ -hexane) (C 2 F 5 ) 3 P0)].
- the content of the organic acid can be appropriately set according to the type of other components, and is not particularly limited.
- the amount of the organic solvent is about 0 to 90 mass%, preferably about 0 to 30 mass%.
- the water content of the etching solution and the stripping solution is about 0 to 50 mass%, preferably about 0 to 30 mass%. If the contents of water and Z or the organic solvent in the etching solution and the stripping solution are too large, it takes too much time to remove the antireflection film and the filling material, or the removal is insufficient.
- the etching solution and the stripping solution of the present invention can be subjected to ultrasonic washing.
- the etching rate of the etching solution and the stripping solution with respect to the antireflection film is preferably at least 0.1 A / min, more preferably at least 0.5 A / min.
- the etching rate of the etching solution for the low-k film is preferably 30 AZ or less, more preferably 1 A / min or less.
- the etching solution of the present invention is advantageously used for removing an antireflection film (particularly, an organic antireflection film) and a resist formed on a low-k film.
- an antireflection film particularly, an organic antireflection film
- a resist formed on a low-k film Alternatively, in a dual damascene process for forming a via hole, it can be advantageously used for etching and removing a filling material, particularly an organic filling material.
- the anti-reflection coating (BARC) is intended to improve the resist line width controllability by suppressing the reflection effect of the substrate under the resist, and to achieve high-precision CD control required for ultra-fine processing of sub-nanomicron and below. It is possible to use a commercially available organic anti-reflection coating material. However, the material is not limited to these.
- the same or similar material as the antireflection film can be used.
- a polymer residue (etching residue) force which is a polymer of an etching gas, when present in a via hole formed by dry etching, an anti-reflection film. This etching residue may be peeled off before or after removing the embedded material by etching.
- an etching solution containing an organic acid or an organic solvent and HF may be used.
- the organic antireflection film and the resist can be removed, and the etching residue can be removed at the same time.
- an etching solution containing an organic solvent and HF is used as a pretreatment solution to remove etching residues, and then an etching solution containing an organic acid and a stripping solution are used in the next step, and an organic antireflection film and a resist are used. Can be removed.
- etching solution and the stripping solution of the present invention can remove all of the organic anti-reflection agent, the resist and the organic embedding material, they can be used in the step of removing all of them in, for example, a Duano Reda machine process. .
- the content of HF can be appropriately set according to the type of other components (organic acid and Z or organic solvent).
- the content of each component is the same, when an organic acid is contained (when an organic acid is contained and an organic solvent is not contained). And about 0.001 to 5 maSS %, preferably about 0.05 to 3 mass%, more preferably about 0.1 to: Lmass%. (Not including organic solvent and not including organic acid): 0.01 to L0ma SS %, preferably 0.1%
- Organic acid and organic solvent power group power at least one selected content, when not containing an organic acid, about 30 to 99.99 mass%, preferably about 50 to 99.95 mass%, more preferably About 90 to 99.9 mass%, more preferably about 95 to 99.9 mass%, and when an organic acid is contained, the total amount of the organic acid and the organic solvent is about 30 to 99.99 mass%, preferably about 70 to 99 mass%. .
- the water content is about 70% by mass or less, preferably about 50% by mass or less, more preferably about 5% by mass or less.
- 100% HF can also be used in the case where dilute hydrofluoric acid (50 mass% aqueous solution) is not used, and when it does not contain water.
- the etching solution for removing the etching residue containing HF according to the present invention and the mixing ratio thereof are shown below.
- the etching solution and the stripping solution of the present invention contain a large amount of water and a non-polar organic solvent and are separated into two phases, they may be used as they are, or may preferably be used after being separated. .
- the more preferable etching solution for removing the etching residue containing HF and the compounding ratio thereof in the present invention are shown below.
- the etching solution of the present invention may contain at least one surfactant selected from the group consisting of anionic, cationic and nonionic surfactants.
- the content of the surfactant is not particularly limited as long as the intended effect of the present invention is exhibited, but is usually
- examples of the organic antireflection film include AR series (trade name, manufactured by Shipley Far East Co., Ltd.) and SKW series (trade name, manufactured by Tokyo Ohka Kogyo Co., Ltd.).
- the low-k film shows a kind damaged by 0 2 plasma Atsu Sing, specifically, relative dielectric constant, the degree than 1 atmospheric instrument 4 or less, preferably degree 3 or less, more preferably 2 It means an insulating film of about 8 or less, more preferably about 2.6 or less.
- low-k films examples include Black Diamond (trade name, manufactured by Applied Materials), Coral (trade name, manufactured by Novellus), LKD series (trade name, manufactured by JSR), Aurora (trade name, ASM) made by the company), HSG series (trade name, manufactured by Hitachi Chemical Co., Ltd.), Nanoglass (trade name, manufactured by Honewell, Inc.), IPS (trade name, manufactured by catalysts & Chemicals Co., Ltd.), Z 3 M (trade name, Dow Corning Co., Ltd.), XLK (trade name, manufactured by Dow Corning), FOx (trade name, manufactured by Dow Corning), Orion (trade name, manufactured by Trikon) and the like.
- KrF krypton F
- ArF ArF
- F 2 the resist and the like, but is not limited thereto.
- a low-k film is formed on a semiconductor substrate (for example, SiN, ⁇ , TaN, SiC, etc.), then an anti-reflection film and a resist are sequentially formed, and then a pattern is formed by photolithography. After the low-k film is etched in accordance with the pattern, the resist (including the deteriorated resist) and the antireflection film can be removed by contacting the low-k film with the etching solution and the stripping solution of the present invention. Next, holes formed by etching the low-k film (for example, In the case where the filling material is filled in the hole and the etching is further performed after the formation of the resist, the filling material can be removed simultaneously with the registration.
- a semiconductor substrate for example, SiN, ⁇ , TaN, SiC, etc.
- a SiN, SiC, SiCN, TaN film, etc. is formed on the low-k film, and the SiN, SiC, SiCN, TaN film, etc. are formed on the low-k film. It can be etched with the film.
- the low-k film and the resist anti-reflection film are usually about 0.01 to 2 ⁇ and about 0.001 to 0.2 ⁇ , respectively, about 0.001 to 0.1 ⁇ m. It has a thickness. Also, the SiN film, SiC film, TaN film, etc. formed as needed usually have a thickness of about 0.001-1 ⁇ m.
- the low-k film may be substantially damaged.
- lighter 0 2 plasma mediation sequencing e.g., change of light 0 2 plasma mediation sequencing before and after the relative dielectric constant is preferably lower than about 20%, more preferably about 10% or less, more preferably 5% or less Or a slight H 2 plasma assing.
- the method for etching a resist, an antireflection film, and a filling material using the etching solution and the stripping solution of the present invention can remove the resist (including a deteriorated resist), the antireflection film, and the filling material, and can reduce the insulating film thickness.
- the temperature and time are such that the low-k film is not substantially damaged.
- the fact that the low-k film does not substantially damage the low-k film means that the properties of the low-k film before and after the treatment using the etching solution and the stripping solution affect the performance of the low-k film when applied to a semiconductor substrate, for example.
- the cross-section in the stacking direction of the film of the workpiece that does not substantially attack (etch) the low-k film at the interface between the resist and the low-k film This means that the shape is not substantially changed, or that the relative dielectric constant of the low-k film is not substantially changed before and after the treatment using the stripping solution.
- substantially no etching of the low-k film means that the etching amount of the low-k film is preferably about 200 nm or less, more preferably about 100 nm or less, and further preferably about 50 nm or less.
- the relative dielectric constant of the low-k film before and after treatment with the etchant and stripper is substantially “No change” means that the relative permittivity change power is preferably about 20% or less, more preferably about 10% or less, and still more preferably about 5% or less.
- the treatment with the etching solution and the stripping solution can be performed, for example, by immersing the substrate after dry etching in the etching solution and the stripping solution of the present invention as an object to be processed.
- the immersion conditions in the etching solution and the stripping solution are not particularly limited as long as the resist and the antireflection film or the filling material can be removed and the low-k film is not substantially damaged. It can be set appropriately according to the type and temperature of the liquid. For example, if the liquid temperature of the etching liquid and the stripping liquid is about 15 to 60 ° C., the immersion may be performed for about 0.1 to 30 minutes, preferably for about 0.5 to 20 minutes.
- the etching solution and the stripping solution are brought into contact with the object to be processed, the resist, the antireflection film, or the filling material can be removed.
- the cleaning may be performed by supplying a liquid and a stripping liquid, or the processing may be performed by continuously spraying an etching liquid and a stripping liquid on the object.
- the treatment with the etching solution and the stripping solution of the present invention may be performed when it is difficult to remove the resist, the antireflection film, or the filling material due to the type of the resist or conditions such as etching. And ultrasonic cleaning may be performed.
- the conditions for performing ultrasonic cleaning are not particularly limited as long as the resist and the antireflection film or the filling material can be removed. However, when the temperature is usually about 23 ° C, 20 to 1200 kHz, 50 to 3000 W At about 0.1 to 20 minutes.
- the resist and the anti-reflection film using the etching solution and the stripping solution of the present invention, or the semiconductor substrate from which the filling material has been removed simultaneously or alone with the resist and the anti-reflection film can be formed by a commonly used method such as copper or aluminum wiring.
- a method described in a detailed semiconductor CMP technique, edited by Toshio Doi, 2001 various types of semiconductor devices can be processed.
- the semiconductor substrate treated with via holes and the like using the etching solution and the stripping solution of the present invention can be used in a conventional method (for example, Atlas of IC Technologies: An Introduction to VLSI Processes by W. aly, 1987 by The According to the method described in Benjamin / Cummings Publishing Company Inc.), various types of semiconductor devices can be processed.
- the etching solution and the stripping solution of the present invention containing HF and an organic acid or an organic solvent may be a titanium-containing compound derived from dry etching (e.g., titanium fluoride, titanium oxide, etc.) Has polymer detergency. Therefore, the etching solution and the stripping solution of the present invention can be used, for example, in a semiconductor manufacturing process, after dry etching, titanium fluoride, polymer, or the like remaining on the side wall and / or bottom surface of a dry etching groove (eg, via hole, trench) or the like. For the purpose of peeling off and etching the groove.
- a dry etching groove e.g., via hole, trench
- the etching solution and the stripping solution of the present invention can be used for cleaning the via hole and the like by peeling off the titanium conjugate and Z or polymer generated in the step of forming the via hole and the like.
- the etching solution and the stripping solution of the present invention it is possible to clean grooves formed by dry etching such as via holes at a low temperature in a short time.
- the etching solution of the present invention containing HF and an organic acid can simultaneously remove a resist residue, a titanium oxide, a polymer, and the like derived from dry etching. Therefore, the etching solution and the stripping solution of the present invention can be used, for example, in a semiconductor manufacturing process, for resist residue after dry etching (and post-assisting) of a metal film above or below a metal capacitor (TiN, Ti, etc.) and a via hole. It can be used for the purpose of simultaneously removing a polymer, a titanium conjugate, and a dry etching residue.
- a gas containing fluorine for example, C 4 F 8
- a substrate or the like containing titanium for example, TiN
- a dry etching gas is used as a dry etching gas.
- polymer 1 refers to a polymer in which an etching gas is polymerized during etching.
- resist residue refers to a residue of a resist generated by asshing after the etching step.
- the treatment using the cleaning liquid of the present invention may be performed on a substrate (for example, a semiconductor substrate on which at least one selected from the group consisting of a via hole, a lower portion of a metal capacitor, and an upper electrode force is formed, the side wall and / or bottom surface of the via hole).
- a substrate for example, a semiconductor substrate on which at least one selected from the group consisting of a via hole, a lower portion of a metal capacitor, and an upper electrode force is formed, the side wall and / or bottom surface of the via hole.
- the resist residue and the polymer or the polymer or the titanium oxide are adhered to the substrate on which the polymer and the Z or titanium compound are adhered, or the metal film on the upper or lower electrode of the metal capacitor (TiN, Ti, etc.).
- the substrate can be immersed in an etching solution.
- the conditions of immersion can be performed by applying a force that can be appropriately set according to the type of the etching solution and the stripping solution, for example, about 15 to 60 ° C., preferably about 0.1 to 20 minutes at about room temperature. .
- the etching liquid and the stripping liquid may be brought into contact with the object to be processed.
- the cleaning object may be supplied while the object to be processed is rotated, and the cleaning solution may be supplied to the object to be processed. Processing may be continued by spraying.
- etching solution and a stripping solution were prepared with the compositions shown in Table 1 below.
- the etching rate for the antireflection film of the test substrate in which the organic antireflection film was formed at 500A on the silicon substrate was obtained.
- a test substrate with Black Diamond (trade name, manufactured by Applied Materials), Coral (trade name, Novellus), and Aurora (trade name, manufactured by ASM) formed on a silicon substrate as a low-k film. The etching rate was determined.
- the etching rate is calculated by dividing the difference in film thickness before and after etching by the etching time.
- the film thickness was measured using Nanospec 3000AF-T manufactured by NanoMetricus Japan.
- the etching was performed by immersing the test substrate in an etching solution and a stripping solution (solution temperature 23 ° C) for 10 minutes.
- an organic anti-reflection film and resist (including those whose surface resist has been altered by etching) are formed on the surface of the low-k film, and an organic filling material is further formed in the via hole.
- An object to be processed having an etching residue in the groove was obtained.
- the object was immersed in the following cleaning solution (Example 23 and Comparative Example 9) at 23 ° C. with stirring for a predetermined time. After the immersion, the peelability of the resist, organic antireflection film, organic burying material and etching residue was observed by photographing with a scanning electron microscope (S-5000), Hitachi, Ltd.
Abstract
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JP2014082329A (ja) * | 2012-10-16 | 2014-05-08 | Hitachi Chemical Co Ltd | 組成物 |
CN110034009A (zh) * | 2017-12-28 | 2019-07-19 | 东京应化工业株式会社 | 返工方法以及酸性清洗液 |
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US20090075034A1 (en) | 2007-09-19 | 2009-03-19 | Nobuhiro Nishita | Patterning method and display device |
CN102382657B (zh) * | 2011-10-11 | 2013-08-07 | 绵阳艾萨斯电子材料有限公司 | 一种透明导电膜用蚀刻液及其制备方法 |
JP7029290B2 (ja) * | 2017-12-28 | 2022-03-03 | 東京応化工業株式会社 | 有機系下層膜を除去する方法、及び酸性洗浄液 |
JP2018121077A (ja) * | 2018-04-19 | 2018-08-02 | 東京エレクトロン株式会社 | 酸化チタン膜の除去方法および除去装置 |
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JP2002510806A (ja) * | 1998-03-30 | 2002-04-09 | エフエスアイ インターナショナル インコーポレイテッド | 有機物除去方法 |
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JP2014082329A (ja) * | 2012-10-16 | 2014-05-08 | Hitachi Chemical Co Ltd | 組成物 |
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